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The Journal of Heredity 1992:83(2):155-156
© 1992 The American Genetic Association 83:155-156

other

Inheritance of Nectary Color in Ipomoea trifida

W. W. Collins

Department of Horticultural Science, North Carolina State University Raleigh, North Carolina 27695-7609

Abstract

Species of the genus Ipomoea Section Batatas have either yellow or cream-colored nectaries (basal flower glands). Within this section, I. batatas (sweet potato) is commercially important and has a high degree of genetic isolation from its related species. I. trifida is purported to be the closest relative of sweet potato. A mutant plant of I. trifida with green nectaries instead of yellow was discovered in the international Ipomoea collection in the International Potato Center, Lima, Peru. Genetic studies were carried out to determine the mode of inheritance of this trait within I. trifida with the intent of describing it as a morphological marker that could be valuable in attempted crosses between species. These studies support the hypothesis that green nectary color is inherited as a monogenic dominant trait over yellow nectary color in I. trifida.


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